It's tricky with this VPN rule because the proof from either side (as of now) are merely their statements:

Hard to prove the VPN usage because even mentions of common ipv4 addresses can simply be reduced to claims - it would be easy to take the IP from a known VPN node and claim that it was used.
Hard to disprove the VPN usage since we don't know the exactness of their methods or the validity of their claims - it is difficult to show evidence of lying unless the data was audited independently or sourced from a third party.

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Even discounting the whole ToS change (I still haven't seen any response to my question), it's extremely strange to confiscate a user's funds simply due to VPN usage: is there a problem with keeping your true IP confidential if you are allowed to play and you're providing personal details elsewhere? ¯\_(ツ)_/¯